Bitwarden through 2023.2.1 offers password auto-fill within a cross-domain IFRAME element. NOTE: the vendor's position is that there have been important legitimate cross-domain configurations (e.g., an apple.com IFRAME element on the icloud.com website) and that "Auto-fill on page load" is not enabled by default.
https://news.ycombinator.com/item?id=35075861
https://github.com/bitwarden/clients/releases
https://flashpoint.io/blog/bitwarden-password-pilfering/
https://cdn.bitwarden.net/misc/Bitwarden%20Security%20Assessment%20Report.pdf